samples: pwm: add the lp_mspm0g3507 to the blinky_pwm and led/pwm samples

The lp_mspm0g3507 has a red LED that can be driven by GPIO or PWM TIMA0
CH0, set maximum prescale and divider to arrive lower timer clock from
clock source. Add to the samples.

Signed-off-by: Saravanan Sekar <[email protected]>

Author: ssekar15

samples/basic/blinky_pwm/boards/lp_mspm0g3507.overlay

@@ -0,0 +1,15 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Copyright (c) 2025 Linumiz GmbH
+ */
+
+&tima0 {
+	ti,clk-prescaler = <255>;
+	ti,clk-div = <8>;
+	status = "okay";
+};
+
+&pwma0 {
+	status = "okay";
+};