esoc: Increase the post power-on delay

Increase the post power-on delay from 50 ms to 150 ms. This is
to give sufficient time for the external modem to complete the
PCIe link training.

Change-Id: I712177d1fc5d160848ccc838cadbb0f85b2fe1a7
Signed-off-by: Raghavendra Rao Ananta <rananta@codeaurora.org>