generic: 6.6: add kernel missing symbol

Add missing symbol CONFIG_SSIF_IPMI_BMC causing bcm53xx compilation errors.

Signed-off-by: Mieczyslaw Nalewaj <[email protected]>

target/linux/generic/config-6.6

@@ -6759,6 +6759,7 @@ CONFIG_SSB_POSSIBLE=y
 # CONFIG_SSB_SDIOHOST is not set
 # CONFIG_SSB_SILENT is not set
 # CONFIG_SSFDC is not set
+# CONFIG_SSIF_IPMI_BMC is not set
 # CONFIG_STACKPROTECTOR is not set
 # CONFIG_STACKPROTECTOR_PER_TASK is not set
 # CONFIG_STACKPROTECTOR_STRONG is not set