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reform/pm: power off via the keyboard first

Now that we have a way to send HID reports, attempt to
power off using the keyboard first, which should work
even if LPC firmware has not been updated.

It also animates a good bye message on the OLED ♥_♥

--- a/sys/src/cmd/reform/pm.c

+++ b/sys/src/cmd/reform/pm.c

@@ -446,8 +446,16 @@

 	}else if(aux == (void*)Pmctl){

 		p = -1;

 		if(nf >= 2 && strcmp(f[0], "power") == 0){

-			if(nf == 2 && strcmp(f[1], "off") == 0)

-				p = Psomoff;

+			if(nf == 2 && strcmp(f[1], "off") == 0){

+				/*

+				 * LPC firmware might not be up to date so try

+				 * shutting down through the keyboard first

+				 */

+				if((kbdhidfd = openkbdhid()) >= 0){

+					write(kbdhidfd, "PWR0", 4);

+					sleep(2000); /* give it a chance */

+				}

+			}

 		}

 		if(p < 0)

 			goto Bad;