Merge "Add __riscv_flush_icache() to <sys/cachectl.h>." into main am: a09f741c2a am: 953b78a72d am: 1cb2c81563 am: 7a62037690

Original change: https://android-review.googlesource.com/c/platform/bionic/+/2655793

Change-Id: I350e52c4ef7d4750665a815553b4eccc3a9c5471
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>