[nrf fromlist] Revert "dts: common: nordic: nrf54l20: set timer frequency to 64MHz"

This reverts commit 413ca65.

Upstream PR #: 82901

Signed-off-by: Andrzej Głąbek <[email protected]>

Author: anangl

dts/common/nordic/nrf54l20.dtsi

@@ -152,8 +152,7 @@
 				cc-num = <6>;
 				max-bit-width = <32>;
 				interrupts = <85 NRF_DEFAULT_IRQ_PRIORITY>;
-				/* NRFX-6881: Temporary workaround for timer00 */
-				max-frequency = <DT_FREQ_M(64)>;
+				max-frequency = <DT_FREQ_M(128)>;
 				prescaler = <0>;
 			};