drivers/video: zero message on MIPI DSI driver

[fdcavalcanti]

Summary

• drivers/video: zero message on MIPI DSI driver
  Use memset to clear the msg struct before using on mipi_dsi_dcs_write_buffer.

Impact

Fixes a bug on MIPI DSI usage where msg struct would be filled with garbage values.
This uses memset to set the struct to 0 before using.

Testing

No specific testing available, but solved issues on a esp32p4-tab5 board MIPI DSI implementation.

[github-actions]

MemBrowse Memory Report

arduino-mega2560

• flash: .text +86 B (+0.1%, 67,400 B / 262,144 B, total: 26% used)

esp32-devkitc

• ROM: .flash.rodata +52 B, .flash.text +828 B (+0.7%, 123,628 B / 4,194,272 B, total: 3% used)
• drom0_0_seg: .flash.rodata +52 B (+0.4%, 13,348 B / 4,194,272 B, total: 0% used)
• irom0_0_seg: .flash.text +828 B (+1.0%, 87,944 B / 3,342,304 B, total: 3% used)

hifive1-revb

• flash: .text +60 B (+0.1%, 83,292 B / 4,194,304 B, total: 2% used)

mirtoo

• kseg0_progmem: .text +100 B (+0.1%, 67,292 B / 131,072 B, total: 51% used)

qemu-armv8a

• Code: .rodata +8 B, .text.nsh_session +8 B, .text.readline_common +872 B (+0.4%, 316,734 B)
• Data: +8 B (+0.0%, 76,970 B)

qemu-intel64

• Code: .text +1,249 B (+0.0%, 8,656,725 B)
• Data: .rodata +96 B (+0.1%, 120,519 B)

rx65n-rsk2mb

• RAM: .bss +16 B (+0.2%, 6,586 B / 262,144 B, total: 3% used)
• ROM: .rodata +4 B, .text +688 B (+0.8%, 86,396 B / 2,097,152 B, total: 4% used)

s698pm-dkit

• Code: .text +2,672 B (+0.7%, 360,880 B)

stm32-nucleo-f103rb

• flash: .text +80 B (+0.2%, 33,884 B / 131,072 B, total: 26% used)