board: atmel: sama5d27_wlsom1_ek: fix SPL OFFS on SPI

Fixes redefinition of CONFIG_SYS_SPI_U_BOOT_OFFS
This is now a Kconfig

Fixes: e40a9ba6d2d5 ("board: atmel: sama5d2_wlsom1_ek: add qspi support and qspi boot config")
Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
2 files changed