soc: qcom: pil: Remove unused variable 'seg_id'

The variable 'seg_id', from the data structure 'pil_seg_data',
is initialized but never used. Hence, remove the member variable
from the structure.

Change-Id: Ida17f05924851f5798aee3ee551ba30471e97a3d
Signed-off-by: Raghavendra Rao Ananta <rananta@codeaurora.org>