mtd: rawnand: brcmnand: Fix ECC level field setting for v7.2 controller

[ Upstream commit 2ec2839a ]

v7.2 controller has different ECC level field size and shift in the acc
control register than its predecessor and successor controller. It needs
to be set specifically.

Fixes: decba6d4

 ("mtd: brcmnand: Add v7.2 controller support")
Signed-off-by: William Zhang <william.zhang@broadcom.com>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Cc: stable@vger.kernel.org
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20230706182909.79151-2-william.zhang@broadcom.com
Signed-off-by: Sasha Levin <sashal@kernel.org>