kernel: add unset CONFIG_INPUT_IBM_PANEL symbol to config-6.1

This symbol was added by commit 2e6f34faa7e0 ("Input: Add IBM Operation
Panel driver") to v6.1. It depends on I2C so it's available to limited
amount of targets. It needs to be specified thought to allow kernel
configuration.

For bcm53xx this fixes:
IBM Operation Panel driver (INPUT_IBM_PANEL) [N/m/?] (NEW)
Signed-off-by: NRafał Miłecki <rafal@milecki.pl>
Reviewed-by: NLinus Walleij <linus.walleij@linaro.org>

target/linux/generic/config-6.1

@@ -2821,6 +2821,7 @@ CONFIG_INOTIFY_USER=y
 # CONFIG_INPUT_GPIO_ROTARY_ENCODER is not set
 # CONFIG_INPUT_GPIO_TILT_POLLED is not set
 # CONFIG_INPUT_GPIO_VIBRA is not set
+# CONFIG_INPUT_IBM_PANEL is not set
 # CONFIG_INPUT_IDEAPAD_SLIDEBAR is not set
 # CONFIG_INPUT_IMS_PCU is not set
 # CONFIG_INPUT_IQS269A is not set