icm20602: clear up some parentheses warning in driver

Icm20602 has some warning need to be clear up:
warning: suggest parentheses around comparison
in operand of '&' [-Wparentheses]

Change-Id: I1a2e76b28aaf5a23afb141ec4d50f898da7fd267
Signed-off-by: zhaochen <zhaochen@codeaurora.org>