arm64: spectre: Rename spectre_v4_patch_fw_mitigation_conduit

The spectre-v4 sequence includes an SMC from the assembly entry code.
spectre_v4_patch_fw_mitigation_conduit is the patching callback that
generates an HVC or SMC depending on the SMCCC conduit type.

As this isn't specific to spectre-v4, rename it
smccc_patch_fw_mitigation_conduit so it can be re-used.

Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: James Morse <james.morse@arm.com>

arch/arm64/kernel/entry.S

@@ -118,7 +118,7 @@ alternative_cb_end
  tbnz \tmp2, #TIF_SSBD, .L__asm_ssbd_skip\@
  mov w0, #ARM_SMCCC_ARCH_WORKAROUND_2
  mov w1, #\state
-alternative_cb spectre_v4_patch_fw_mitigation_conduit
+alternative_cb smccc_patch_fw_mitigation_conduit
  nop // Patched to SMC/HVC #0
 alternative_cb_end
 .L__asm_ssbd_skip\@:

arch/arm64/kernel/proton-pack.c

@@ -554,9 +554,9 @@ void __init spectre_v4_patch_fw_mitigation_enable(struct alt_instr *alt,
  * Patch a NOP in the Spectre-v4 mitigation code with an SMC/HVC instruction
  * to call into firmware to adjust the mitigation state.
  */
-void __init spectre_v4_patch_fw_mitigation_conduit(struct alt_instr *alt,
-   __le32 *origptr,
-   __le32 *updptr, int nr_inst)
+void __init smccc_patch_fw_mitigation_conduit(struct alt_instr *alt,
+   __le32 *origptr,
+   __le32 *updptr, int nr_inst)
 {
  u32 insn;