net: ipa: Remove useless error message

Fix the following coccicheck report:

drivers/net/ipa/gsi.c:1341:2-9:
line 1341 is redundant because platform_get_irq() already prints an error

Remove dev_err() messages after platform_get_irq_byname() failures.

Signed-off-by: Zihao Tang <tangzihao1@hisilicon.com>
Signed-off-by: Jay Fang <f.fangjian@huawei.com>
Reviewed-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>