refactor(st-clock): remove LSEDRV_MEDIUM_HIGH for STM32MP13

Remove useless LSEDRV_MEDIUM_HIGH definition in clk-stm32mp13.c.
It's already defined in include/dt-bindings/clock/stm32mp13-clksrc.h.

Signed-off-by: Gabriel Fernandez <gabriel.fernandez@foss.st.com>
Change-Id: Ie3fa4711930f922fa0733ba7c76d72ec9639e9a5
diff --git a/drivers/st/clk/clk-stm32mp13.c b/drivers/st/clk/clk-stm32mp13.c
index 1dbe841..267a44a 100644
--- a/drivers/st/clk/clk-stm32mp13.c
+++ b/drivers/st/clk/clk-stm32mp13.c
@@ -2077,8 +2077,6 @@
 	return 0;
 }
 
-#define LSEDRV_MEDIUM_HIGH 2
-
 static int clk_stm32_parse_oscillator_fdt(void *fdt, int node, const char *name,
 					  struct stm32_osci_dt_cfg *osci)
 {