ena: Update driver version to v2.7.0

Features:
* Introduce customer and SRD metrics through sysctl
* Introduce spreading IRQs to CPUs capability using sysctl
* Upgrade ena-com to v2.7.0

Bug Fixes:
* Remove outdated APIs

Minor Changes:
* Introduce a shared stats sample interval for all stats

Approved by: cperciva (mentor)
MFC after: 2 weeks
Sponsored by: Amazon, Inc.

sys/dev/ena/ena.h

@@ -38,8 +38,8 @@
 #include "ena-com/ena_eth_com.h"
 
 #define ENA_DRV_MODULE_VER_MAJOR	2
-#define ENA_DRV_MODULE_VER_MINOR	6
-#define ENA_DRV_MODULE_VER_SUBMINOR	3
+#define ENA_DRV_MODULE_VER_MINOR	7
+#define ENA_DRV_MODULE_VER_SUBMINOR	0
 
 #define ENA_DRV_MODULE_NAME		"ena"