zephyr: isl923x: Remove ramp test in init
zephyr: isl923x: Remove ramp test in init

The driver disables input regulation on initialization until other
tasks such as USB-C, charger_manager, etc. have had time to gather
information about the state of the connected charger. Because of this
no voltage ramping occurs and the test is unnecessary.

BUG=b:224616537
BRANCH=none
TEST=make -j runtests
     zmake testall

Signed-off-by: Sam Hurst <500b4cddcd66abe3fe333e92c4c95d7f41e62e4e@google.com>
Change-Id: I84e68ecd13b5f8ef4dfe140e3ed040e5368925cd
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/3612208
Reviewed-by: Al Semjonovs <c3a2ecb550cad1e7d5a943ca6241377f7b43ffc4@google.com>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec