tests: i2s_speed: Fix RT1170_EVK overlay files

Remove an overlay with a wrong name not being picked up,
and change the "A" revision overlay to be used by all revisions.

Also fix the "clocks" property in the overlay causing a fault with sai4.

Signed-off-by: Declan Snyder <[email protected]>

Author: decsny

tests/drivers/i2s/i2s_speed/boards/mimxrt1170_evk_mimxrt1176_cm7_A.conf renamed to tests/drivers/i2s/i2s_speed/boards/mimxrt1170_evk_mimxrt1176_cm7.conf

@@ -13,7 +13,6 @@
 /* Enable SAI4, and set clocks to match SAI1 */
 &sai4 {
 	status = "okay";
-	clocks = < &ccm 0x2003 0x2184 0x6 >;
 	podf = < 0x4 >;
 	pinctrl-0 = <&pinmux_sai4>;
 	pinctrl-names = "default";