mtd: rawnand: brcmnand: Rename bcm63138 nand driver

In preparing to support multiple BCMBCA SoCs, rename bcm63138 to bcmbca
in the driver code and driver file name.

Signed-off-by: William Zhang <william.zhang@broadcom.com>
Reviewed-by: David Regan <dregan@broadcom.com>
Acked-by: Florian Fainelli <florian.fainelli@broadcom.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20240223034758.13753-11-william.zhang@broadcom.com