drm/panel: panel-simple: Fix proper bpc for AM-1280800N3TZQW-T00H

drm/panel: panel-simple: Fix proper bpc for AM-1280800N3TZQW-T00H

[ Upstream commit 7eafbecd2288c542ea15ea20cf1a7e64a25c21bc ]

AM-1280800N3TZQW-T00H panel support 8 bpc not 6 bpc as per
recent testing in i.MX8MM platform.

Fix it.

Fixes: bca684e69c4c ("drm/panel: simple: Add AM-1280800N3TZQW-T00H")
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Robert Foss <robert.foss@linaro.org>
Signed-off-by: Robert Foss <robert.foss@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20211111094103.494831-1-jagan@amarulasolutions.com
Signed-off-by: Sasha Levin <sashal@kernel.org>