platform / x86 / PM: Fix unused function warnings for CONFIG_PM_SLEEP

According to compiler warnings, quite some suspend/resume functions
in platform x86 drivers are not used for CONFIG_PM_SLEEP unset, so
add #ifdefs to prevent them from being built in that case.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>

diff --cc drivers/platform/x86/classmate-laptop.c
Simple merge

diff --cc drivers/platform/x86/fujitsu-tablet.c
Simple merge

diff --cc drivers/platform/x86/hdaps.c
Simple merge

diff --cc drivers/platform/x86/hp_accel.c
Simple merge

diff --cc drivers/platform/x86/msi-laptop.c
Simple merge

diff --cc drivers/platform/x86/panasonic-laptop.c
Simple merge

diff --cc drivers/platform/x86/sony-laptop.c
Simple merge

diff --cc drivers/platform/x86/thinkpad_acpi.c
Simple merge

diff --cc drivers/platform/x86/toshiba_acpi.c
Simple merge

diff --cc drivers/platform/x86/toshiba_bluetooth.c
Simple merge

diff --cc drivers/platform/x86/xo15-ebook.c
Simple merge