msm: ipa4: Ignore newline ending character on ipa write input

ipa_write character device function is called from user space
to pass configuration during boot. Ignore ending \n character
at the given string.

Change-Id: I33ee23ddfcc40b9693da7542bbb7b1cebff975f4
CRs-fixed: 2156924
Signed-off-by: Ghanim Fodi <gfodi@codeaurora.org>
Signed-off-by: Amir Levy <alevy@codeaurora.org>