begonia: Set arch variant to armv8-2a-dotprod

begonia:/ $ cat /proc/cpuinfo | grep Features -m 1
Features        : fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics fphp asimdhp cpuid asimdrdm lrcpc dcpop asimddp

From this, it's evident that our CPU (G90T) supports
all the features of ARMv8.2-DotProd [1]. This should unlock some
optimizations in different code paths.

[1]: https://en.wikichip.org/wiki/arm/armv8#ARMv8_Extensions_and_Processor_Features

Change-Id: I54c5901aa6e02dad4fbe20af9221c54d3e6b82ce
Signed-off-by: 7Soldier <reg.fm4@gmail.com>

BoardConfig.mk

@@ -18,7 +18,7 @@ DEVICE_PATH := device/xiaomi/begonia
 
 # Architecture
 TARGET_ARCH := arm64
-TARGET_ARCH_VARIANT := armv8-2a
+TARGET_ARCH_VARIANT := armv8-2a-dotprod
 TARGET_CPU_ABI := arm64-v8a
 TARGET_CPU_ABI2 :=
 TARGET_CPU_VARIANT := generic