ec/lenovo/pmh7/chip.h: Use 'bool' instead of 'int'

This to fix following error using Clang-16.0.0:
/cb-build/coreboot-toolchain.0/clang/LENOVO_W500/mainboard/lenovo/t400/static.c:135:22: error: implicit truncation from 'int' to a one-bit wide bit-field changes value from 1 to -1 [-Werror,-Wsingle-bit-bitfield-constant-conversion]
        .backlight_enable = 0x01,
                            ^~~~
/cb-build/coreboot-toolchain.0/clang/LENOVO_W500/mainboard/lenovo/t400/static.c:136:23: error: implicit truncation from 'int' to a one-bit wide bit-field changes value from 1 to -1 [-Werror,-Wsingle-bit-bitfield-constant-conversion]
        .dock_event_enable = 0x01,
                             ^~~~

Change-Id: Icd35224877fee355e1bbb8a8e838cb047604babb
Signed-off-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/73810
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Singer <felixsinger@posteo.net>
diff --git a/src/mainboard/lenovo/t430/devicetree.cb b/src/mainboard/lenovo/t430/devicetree.cb
index 7e54383..35c23b8 100644
--- a/src/mainboard/lenovo/t430/devicetree.cb
+++ b/src/mainboard/lenovo/t430/devicetree.cb
@@ -64,8 +64,8 @@
 			device ref pci_bridge off end # PCI bridge
 			device ref lpc on # LPC bridge PCI-LPC bridge
 				chip ec/lenovo/pmh7
-					register "backlight_enable" = "0x01"
-					register "dock_event_enable" = "0x01"
+					register "backlight_enable" = "true"
+					register "dock_event_enable" = "true"
 					device pnp ff.1 on end # dummy
 				end
 				chip ec/lenovo/h8