spi: bcm63xx-spi: fix shared reset

spi: bcm63xx-spi: fix shared reset

Some bmips SoCs (bcm6362, bcm63268) share the same SPI reset for both SPI
and HSSPI controllers, so reset shouldn't be exclusive.

Fixes: 38807adeaf1e ("spi: bcm63xx-spi: add reset support")
Reported-by: Jonas Gorski <jonas.gorski@gmail.com>
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Link: https://patch.msgid.link/20250529130915.2519590-2-noltari@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>