Update some default configs to reduce memory use

[h2zero]

Summary by CodeRabbit

• New Features
  • Added default configuration options for BLE runtime sizing: transport event discardable count, periodic sync limit, and multi-advertiser instance count. These settings can be customized per device if needed.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 56a96b90-1997-4e7e-a540-c535614fdd0b

📥 Commits

Reviewing files that changed from the base of the PR and between 4746c60 and 7300b1d.

📒 Files selected for processing (2)

• src/syscfg/devcfg/nrf51cfg.h
• src/syscfg/devcfg/nrf52810cfg.h

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📝 Walkthrough

Walkthrough

Two Nordic device configuration headers (nrf51cfg.h and nrf52810cfg.h) are updated with conditional default macros for BLE runtime sizing: MYNEWT_VAL_BLE_TRANSPORT_EVT_DISCARDABLE_COUNT (8), MYNEWT_VAL_BLE_MAX_PERIODIC_SYNCS (0), and MYNEWT_VAL_BLE_MULTI_ADV_INSTANCES (0). The nrf51 config additionally reformats existing PHY feature macros.

Changes

Cohort / File(s)	Summary
BLE Configuration Macro Defaults src/syscfg/devcfg/nrf51cfg.h	Added three new conditional macro definitions (BLE_TRANSPORT_EVT_DISCARDABLE_COUNT, BLE_MAX_PERIODIC_SYNCS, BLE_MULTI_ADV_INSTANCES). Reformatted two existing PHY feature macros (LE_2M_PHY, LE_CODED_PHY) with explicit parentheses; values remain (0).
BLE Configuration Macro Defaults src/syscfg/devcfg/nrf52810cfg.h	Added three new conditional macro definitions (BLE_TRANSPORT_EVT_DISCARDABLE_COUNT, BLE_MAX_PERIODIC_SYNCS, BLE_MULTI_ADV_INSTANCES) with defaults 8, 0, and 0 respectively, guarded by #ifndef checks.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

⚓ Configuration macros set sail today,
Defaults for BLE channels now in place,
Nordic devices charting steady course,
No storms ahead—just steady force! 🏴‍☠️

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately reflects the main objective of the pull request—adding default configuration macros to reduce memory use in Nordic device configurations.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch nrf-mem-use

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