arm64/sysreg: improve comment for regs without fields

Currently for registers without fields we create a comment pointing at
the common definitions, e.g.

| #define REG_TTBR0_EL1                           S3_0_C2_C0_0
| #define SYS_TTBR0_EL1                           sys_reg(3, 0, 2, 0, 0)
| #define SYS_TTBR0_EL1_Op0                       3
| #define SYS_TTBR0_EL1_Op1                       0
| #define SYS_TTBR0_EL1_CRn                       2
| #define SYS_TTBR0_EL1_CRm                       0
| #define SYS_TTBR0_EL1_Op2                       0
|
| /* See TTBRx_EL1 */

It would be slightly nicer if the comment said what we should be looking
for, e.g.

| #define REG_TTBR0_EL1                           S3_0_C2_C0_0
| #define SYS_TTBR0_EL1                           sys_reg(3, 0, 2, 0, 0)
| #define SYS_TTBR0_EL1_Op0                       3
| #define SYS_TTBR0_EL1_Op1                       0
| #define SYS_TTBR0_EL1_CRn                       2
| #define SYS_TTBR0_EL1_CRm                       0
| #define SYS_TTBR0_EL1_Op2                       0
|
| /* For TTBR0_EL1 fields see TTBRx_EL1 */

Update the comment generation accordingly.

Signed-off-by: Mark Rutland <[email protected]>
Cc: Mark Brown <[email protected]>
Cc: Will Deacon <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Catalin Marinas <[email protected]>

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