ArmLib: add functions to read system registers

ArmCpuInfo uses those to read system registers and other parts of EDK2
may find them useful.

Signed-off-by: Marcin Juszkiewicz <marcin.juszkiewicz@linaro.org>
Reviewed-by: Leif Lindholm <quic_llindhol@quicinc.com>

ArmPkg/Library/ArmLib/AArch64/AArch64Lib.h

@@ -40,7 +40,43 @@ ArmCleanInvalidateDataCacheEntryBySetWay (
 
 UINTN
 EFIAPI
-ArmReadIdAA64Pfr0 (
+ArmReadIdAA64Dfr0 (
+  VOID
+  );
+
+UINTN
+EFIAPI
+ArmReadIdAA64Dfr1 (
+  VOID
+  );
+
+UINTN
+EFIAPI
+ArmReadIdAA64Isar0 (
+  VOID
+  );
+
+UINTN
+EFIAPI
+ArmReadIdAA64Isar1 (
+  VOID
+  );
+
+UINTN
+EFIAPI
+ArmReadIdAA64Isar2 (
+  VOID
+  );
+
+UINTN
+EFIAPI
+ArmReadIdAA64Mmfr0 (
+  VOID
+  );
+
+UINTN
+EFIAPI
+ArmReadIdAA64Mmfr1 (
   VOID
   );
 
@@ -54,4 +90,16 @@ ArmReadIdAA64Mmfr2 (
   VOID
   );
 
+UINTN
+EFIAPI
+ArmReadIdAA64Pfr0 (
+  VOID
+  );
+
+UINTN
+EFIAPI
+ArmReadIdAA64Pfr1 (
+  VOID
+  );
+
 #endif // AARCH64_LIB_H_