firmware: config: ti-sci: Default set to ARCH_K3 for the ti sci driver

firmware: config: ti-sci: Default set to ARCH_K3 for the ti sci driver

With ARCH_K3=y we cannot enable TI_SCI_PROTOCOL=m because
ARCH_K3 selects TI_SCI_PROTOCOL.

Modify the logic to enable TI_SCI_PROTOCOL by default when ARCH_K3=y
allowing us to submit a future patch to remove select on ARCH_K3 without
breaking existing users.

Signed-off-by: Guillaume La Roque <glaroque@baylibre.com>
Reviewed-by: Kevin Hilman <khilman@baylibre.com>
Link: https://lore.kernel.org/r/20250220-ti-firmware-v2-1-ff26883c6ce9@baylibre.com
Signed-off-by: Nishanth Menon <nm@ti.com>