ARM: dts: aspeed: Adjust "reg" property of FMC/SPI controllers

ARM: dts: aspeed: Adjust "reg" property of FMC/SPI controllers

This is compatible with the current driver and addresses issues when
running 'make dt_binding_check'.

Cc: Chin-Ting Kuo <chin-ting_kuo@aspeedtech.com>
Tested-by: Joel Stanley <joel@jms.id.au>
Tested-by: Tao Ren <rentao.bupt@gmail.com>
Tested-by: Jae Hyun Yoo <quic_jaehyoo@quicinc.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Link: https://lore.kernel.org/r/20220509175616.1089346-2-clg@kaod.org
Signed-off-by: Joel Stanley <joel@jms.id.au>