msm: ipa: exit when hdr proc ctx table is full

Return error when header processing table is full so that ipa
driver does not add infinite number of headers in SW cache.

Change-Id: I97360dec3ec892aab688d332122c75283c3e6cf6
Acked-by: Shihuan Liu <shihuanl@qti.qualcomm.com>
Signed-off-by: Skylar Chang <chiaweic@codeaurora.org>