arm64: Move Azure-specific config from std.hyperv to std.azure

Hyper-V does not provide Mellanox hardware, some of Azure's instances
do, thus the configuration to enable them does not belong in the generic
std.hyperv config.

Fixes:	15e7fa83ef ("arm64: Hyper-V: Add vPCI and Mellanox driver modules into build")

sys/arm64/conf/GENERIC

@@ -29,6 +29,7 @@ include		"std.allwinner"
 include		"std.altera"
 include		"std.amd"
 include		"std.arm"
+include		"std.azure"
 include		"std.broadcom"
 include		"std.cavium"
 include		"std.ec2"

sys/arm64/conf/std.azure

@@ -0,0 +1,15 @@
+#
+# Azure support
+#
+
+device		hyperv
+
+options 	COMPAT_LINUXKPI
+device		xz
+
+device		mlx5
+device		mlxfw
+device		mlx5en
+options 	RATELIMIT
+options 	KERN_TLS
+device		firmware

sys/arm64/conf/std.hyperv

@@ -4,13 +4,3 @@
 
 #hyper-v support
 device		hyperv
-
-options 	COMPAT_LINUXKPI
-device		xz
-
-device		mlx5
-device		mlxfw
-device		mlx5en
-options 	RATELIMIT
-options 	KERN_TLS
-device		firmware