macintosh/via-pmu68k: Don't load driver on unsupported hardware

Don't load the via-pmu68k driver on early PowerBooks. The M50753 PMU
device found in those models was never supported by this driver.
Attempting to load the driver usually causes a boot hang.

Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Reviewed-by: Michael Schmitz <schmitzmic@gmail.com>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/m68k/mac/misc.c

@@ -478,8 +478,7 @@ void mac_poweroff(void)
 		cuda_shutdown();
 #endif
 #ifdef CONFIG_ADB_PMU68K
-	} else if (macintosh_config->adb_type == MAC_ADB_PB1
-		|| macintosh_config->adb_type == MAC_ADB_PB2) {
+	} else if (macintosh_config->adb_type == MAC_ADB_PB2) {
 		pmu_shutdown();
 #endif
 	}
@@ -520,8 +519,7 @@ void mac_reset(void)
 		cuda_restart();
 #endif
 #ifdef CONFIG_ADB_PMU68K
-	} else if (macintosh_config->adb_type == MAC_ADB_PB1
-		|| macintosh_config->adb_type == MAC_ADB_PB2) {
+	} else if (macintosh_config->adb_type == MAC_ADB_PB2) {
 		pmu_restart();
 #endif
 	} else if (CPU_IS_030) {