regulator: mt6360: remove redundant error print

fixes coccicheck warning:

drivers/regulator/mt6360-regulator.c:384:3-10: line 384 is
redundant because platform_get_irq() already prints an error

in fact it is not platform_get_irq but platform_get_irq_byname print error

Signed-off-by: Jian Dong <dongjian@yulong.com>
Link: https://lore.kernel.org/r/1616555474-158789-1-git-send-email-dj0227@163.com
Signed-off-by: Mark Brown <broonie@kernel.org>