target/riscv: implement abstract command cache #1235
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Implemented cache of unsupported abstract commands. It's purpose is to replace set of caching variables to one. So this commit provides one ac_not_supported_cache instead of abstract_read_csr_supported,
abstract_write_csr_supported, abstract_read_fpr_supported, abstract_write_fpr_supported, has_aampostincrement.
Dropped check for buggy aampostincrement
Fixes #1232
Change-Id: I75cae1481841f2cd0393d6cc80f0d913fbe34294