generic: 6.1: add missing config SPI_BCM63XX_HSSPI

Add missing config SPI_BCM63XX_HSSPI for kernel 6.1 triggered on
compilation of bcm4908.

Signed-off-by: Christian Marangi <[email protected]>

target/linux/generic/config-6.1

@@ -6480,6 +6480,7 @@ CONFIG_SND_X86=y
 # CONFIG_SPI_AX88796C is not set
 # CONFIG_SPI_AXI_SPI_ENGINE is not set
 # CONFIG_SPI_BCM2835 is not set
+# CONFIG_SPI_BCM63XX_HSSPI is not set
 # CONFIG_SPI_BCM_QSPI is not set
 # CONFIG_SPI_BITBANG is not set
 # CONFIG_SPI_BUTTERFLY is not set