arm64: sysreg: Correct sign definitions for EIESB and DoubleLock

The `ID_AA64MMFR4_EL1.EIESB` field, is an unsigned enumeration, but was
incorrectly defined as a `SignedEnum` when introduced in commit
cfc680b ("arm64: sysreg: Add layout for ID_AA64MMFR4_EL1"). This is
corrected to `UnsignedEnum`.

Conversely, the `ID_AA64DFR0_EL1.DoubleLock` field, is a signed
enumeration, but was incorrectly defined as an `UnsignedEnum`. This is
corrected to `SignedEnum`, which wasn't correctly set when annotated as
such in commit ad16d4c ("arm64/sysreg: Initial unsigned annotations
for ID registers").

Signed-off-by: Fuad Tabba <tabba@google.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>

Author: Fuad Tabba

arch/arm64/tools/sysreg

@@ -1693,7 +1693,7 @@ UnsignedEnum	43:40	TraceFilt
 	0b0000	NI
 	0b0001	IMP
 EndEnum
-UnsignedEnum	39:36	DoubleLock
+SignedEnum	39:36	DoubleLock
 	0b0000	IMP
 	0b1111	NI
 EndEnum
@@ -2409,7 +2409,7 @@ UnsignedEnum	11:8	ASID2
 	0b0000	NI
 	0b0001	IMP
 EndEnum
-SignedEnum	7:4	EIESB
+UnsignedEnum	7:4	EIESB
 	0b0000	NI
 	0b0001	ToEL3
 	0b0010	ToELx