ANDROID: GKI: Enable CONFIG_RT_SOFTIRQ_AWARE_SCHED

This config helps address audio buffer underrun issues on arm64 targets.

Signed-off-by: J. Avila <elavila@google.com>
[jstultz: Rebased to android-mainline, also enabled on x86]
Signed-off-by: John Stultz <jstultz@google.com>
[xuewen: enabled on riscv]
Signed-off-by: Xuewen Yan <xuewen.yan@unisoc.com>
Signed-off-by: John Stultz <jstultz@google.com>
Bug: 168521633
Bug: 332627282
Change-Id: If0e356241bebc282070e000662745739ecfaf30a