The DCache clean & ICache invalidation requirements for instructions
to be data coherence are discoverable through new fields in CTR_EL0.
Let's support the two bits if they are enabled, the CPU core will
not execute the unnecessary DCache clean or Icache Invalidation
instructions.

2019-09-25  Shaokun Zhang  <zhangshaokun@hisilicon.com>

	* config/aarch64/sync-cache.c (__aarch64_sync_cache_range): Add support for
	CTR_EL0.IDC and CTR_EL0.DIC.

From-SVN: r276122