ieee802154: Fix build error

If REGMAP_SPI is m and IEEE802154_MCR20A is y,

mcr20a.c:(.text+0x3ed6c5b): undefined reference to `__devm_regmap_init_spi'
ld: mcr20a.c:(.text+0x3ed6cb5): undefined reference to `__devm_regmap_init_spi'

Select REGMAP_SPI for IEEE802154_MCR20A to fix it.

Fixes: 8c6ad9cc5157 ("ieee802154: Add NXP MCR20A IEEE 802.15.4 transceiver driver")
Signed-off-by: Jinjie Ruan <[e-mail]>
Link: https://lore.kernel.org/[e-mail]
Signed-off-by: Stefan Schmidt <[e-mail]>

drivers/net/ieee802154/Kconfig

···
 
 config IEEE802154_MCR20A
 	tristate "MCR20A transceiver driver"
+	select REGMAP_SPI
 	depends on IEEE802154_DRIVERS && MAC802154
 	depends on SPI
 	help