esoc: Change the toggle delay for external modem.

Minimum toggle delay needed to ensure reset occurs correctly is
120ms. Change the minimum bound of usleep_range to 120ms.

Change-Id: I3a2a4301787ff5032698adc979cbf57153ecacfc
Signed-off-by: Rishabh Bhatnagar <rishabhb@codeaurora.org>