aarch64: Update feature RAS system registers

This patch:
+ updates RAS feature system registers with new RAS 1.1 regs.
+ extends RAS/RAS 1.1 support for all architecture levels of Armv8-A.

Please note that early Armv8-A architectures do not officially support RAS
extension.

Rationale of the patch:
To ease development so that user-friendly RAS system registers operands can be
used. Certain use cases require developers to enable only more generic
architecture (e.g. -march=armv8-a) during system development. Users must use
RAS extension registers bearing in mind that system they use must support it.

The RAS (Reliability, Availability, Serviceability) extension is a
system-level extension that defines a number of system registers.

RAS 1.1 (FEAT_RASv1p1) introduces five new system registers:
ERXPFGCTL_EL1, ERXPFGCDN_EL1, ERXMISC2_EL1, ERXMISC3_EL1 and
ERXPFGF_EL1.

For details see [0].

[0] https://developer.arm.com/docs/ddi0595/i/

include/opcode/aarch64.h

@@ -97,6 +97,7 @@ typedef uint32_t aarch64_insn;
 #define AARCH64_ARCH_V8		AARCH64_FEATURE (AARCH64_FEATURE_V8, \
 						 AARCH64_FEATURE_V8_A \
 						 | AARCH64_FEATURE_FP  \
+						 | AARCH64_FEATURE_RAS \
 						 | AARCH64_FEATURE_SIMD)
 #define AARCH64_ARCH_V8_1	AARCH64_FEATURE (AARCH64_ARCH_V8, \
 						 AARCH64_FEATURE_CRC	\
@@ -106,8 +107,7 @@ typedef uint32_t aarch64_insn;
 						 | AARCH64_FEATURE_LOR	\
 						 | AARCH64_FEATURE_RDMA)
 #define AARCH64_ARCH_V8_2	AARCH64_FEATURE (AARCH64_ARCH_V8_1,	\
-						 AARCH64_FEATURE_V8_2	\
-						 | AARCH64_FEATURE_RAS)
+						 AARCH64_FEATURE_V8_2)
 #define AARCH64_ARCH_V8_3	AARCH64_FEATURE (AARCH64_ARCH_V8_2,	\
 						 AARCH64_FEATURE_V8_3	\
 						 | AARCH64_FEATURE_RCPC	\