event: Use an event to replace last_stage_init()

Add a new event which handles this function. Convert existing use of
the function to use the new event instead.

Make sure that EVENT is enabled by affected boards, by selecting it from
the LAST_STAGE_INIT option. For x86, enable it by default since all boards
need it.

For controlcenterdc, inline the get_tpm() function and make sure the event
is not built in SPL.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/Kconfig b/arch/Kconfig
index c9a3359..90345cb 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -252,6 +252,7 @@
 	imply DM_SPI
 	imply DM_SPI_FLASH
 	imply DM_USB
+	imply LAST_STAGE_INIT
 	imply VIDEO
 	imply SYSRESET
 	imply SPL_SYSRESET