[Android] Fix NEON detection with AArch64

On AArch64 asimd is the new name for NEON.
This fixes a message on application start in Android about the device not supporting NEON.
If it's AArch64 then it supports NEON!
Merge pull request #1616 from Sonicadvance1/asimd_is_neon

[Android] Fix NEON detection with AArch64