powerpc-opal: fix spelling mistake "Uniterrupted" -> "Uninterrupted"

Trivial fix to spelling mistake in hmi_error_types text
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Stewart Smith <stewart@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/platforms/powernv/opal-hmi.c

@@ -177,7 +177,7 @@ static void print_hmi_event_info(struct OpalHMIEvent *hmi_evt)
 		"Processor recovery occurred for masked error",
 		"Timer facility experienced an error",
 		"TFMR SPR is corrupted",
-		"UPS (Uniterrupted Power System) Overflow indication",
+		"UPS (Uninterrupted Power System) Overflow indication",
 		"An XSCOM operation failure",
 		"An XSCOM operation completed",
 		"SCOM has set a reserved FIR bit to cause recovery",