riscv: enable SiFive errata CIP-453 and CIP-1200 Kconfig only if CONFIG_64BIT=y

The corresponding hardware issues of CONFIG_ERRATA_SIFIVE_CIP_453 and
CONFIG_ERRATA_SIFIVE_CIP_1200 only exist in the SiFive 64bit CPU cores.
Therefore, these two errata are required only if CONFIG_64BIT=y

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Vincent Chen <vincent.chen@sifive.com>
Fixes: bff3ff5 ("riscv: sifive: Apply errata "cip-1200" patch")
Fixes: 800149a ("riscv: sifive: Apply errata "cip-453" patch")
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>

Author: VincentZWC

arch/riscv/Kconfig.erratas

@@ -21,7 +21,7 @@ config ERRATA_SIFIVE
 
 config ERRATA_SIFIVE_CIP_453
 	bool "Apply SiFive errata CIP-453"
-	depends on ERRATA_SIFIVE
+	depends on ERRATA_SIFIVE && 64BIT
 	default y
 	help
 	  This will apply the SiFive CIP-453 errata to add sign extension
@@ -32,7 +32,7 @@ config ERRATA_SIFIVE_CIP_453
 
 config ERRATA_SIFIVE_CIP_1200
 	bool "Apply SiFive errata CIP-1200"
-	depends on ERRATA_SIFIVE
+	depends on ERRATA_SIFIVE && 64BIT
 	default y
 	help
 	  This will apply the SiFive CIP-1200 errata to repalce all