mmc: core: don't include 'pm_wakeup.h' directly

The header clearly states that it does not want to be included directly,
only via 'device.h'. 'platform_device.h' works equally well. Remove the
direct inclusion.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Message-ID: <20241118072917.3853-9-wsa+renesas@sang-engineering.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>