phy: exynos5-usbdrd: make phy_isol() take a bool for clarity

phy: exynos5-usbdrd: make phy_isol() take a bool for clarity

on / not on is just a boolean flag and is a bit misleading as currently
on==1 means to turn off the power, and on==0 to turn power on.

Rename the flag and make it a bool to avoid confusion of future readers
of this code. No functional change.

While at it, fix a whitespace issue in nearby comment.

No functional change.

Signed-off-by: André Draszik <andre.draszik@linaro.org>
Reviewed-by: Peter Griffin <peter.griffin@linaro.org>
Link: https://lore.kernel.org/r/20240507-samsung-usb-phy-fixes-v1-3-4ccba5afa7cc@linaro.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>