kernel: remove CONFIG_GPIO_MCP23S08 from default kernel configs

The kernel config option 'CONFIG_GPIO_MCP23S08' no longer exists.
Therefore, it is removed from the generic kernel configuration for
linux-5.10 and linux-5.15.

Signed-off-by: Florian Eckert <[email protected]>

target/linux/generic/config-5.10

@@ -2123,7 +2123,6 @@ CONFIG_GPIOLIB_FASTPATH_LIMIT=512
 # CONFIG_GPIO_MAX732X is not set
 # CONFIG_GPIO_MB86S7X is not set
 # CONFIG_GPIO_MC33880 is not set
-# CONFIG_GPIO_MCP23S08 is not set
 # CONFIG_GPIO_ML_IOH is not set
 # CONFIG_GPIO_MOCKUP is not set
 # CONFIG_GPIO_MPC8XXX is not set

target/linux/generic/config-5.15

@@ -2205,7 +2205,6 @@ CONFIG_GPIOLIB_FASTPATH_LIMIT=512
 # CONFIG_GPIO_MAX732X is not set
 # CONFIG_GPIO_MB86S7X is not set
 # CONFIG_GPIO_MC33880 is not set
-# CONFIG_GPIO_MCP23S08 is not set
 # CONFIG_GPIO_ML_IOH is not set
 # CONFIG_GPIO_MOCKUP is not set
 # CONFIG_GPIO_MPC8XXX is not set