soc: fsl: qe: remove unused qe_ic_from_irq function

clang with W=1 reports
drivers/soc/fsl/qe/qe_ic.c:235:29: error: unused function  'qe_ic_from_irq' [-Werror,-Wunused-function]

The use of this function was removed with
commit d7c2878c ("soc: fsl: qe: remove unused qe_ic_set_* functions")

Signed-off-by: Tom Rix <trix@redhat.com>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Link: https://lore.kernel.org/r/20230320125202.1721775-1-trix@redhat.com
Link: https://lore.kernel.org/all/1619002613-18216-1-git-send-email-jiapeng.chong@linux.alibaba.com/


[krzk: Adjust commit msg]
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>