clock_controller: stm32n6: Remove AXISRAM3/4/5/6 clocks handling

Now that they are handled through their dedicated driver, remove
clock activation for AXISRAM3/4/5/6 (which was useless anyway as
RAMCFG part was missing).

Signed-off-by: Erwan Gouriou <erwan.gouriou@st.com>

drivers/clock_control/clock_stm32_ll_n6.c

@@ -923,12 +923,11 @@ int stm32_clock_control_init(const struct device *dev)
 
 	ARG_UNUSED(dev);
 
-	/* For now, enable clocks (including low_power ones) of all RAM */
-	uint32_t all_ram = LL_MEM_AXISRAM1 | LL_MEM_AXISRAM2 | LL_MEM_AXISRAM3 | LL_MEM_AXISRAM4 |
-			   LL_MEM_AXISRAM5 | LL_MEM_AXISRAM6 | LL_MEM_AHBSRAM1 | LL_MEM_AHBSRAM2 |
+	/* For now, enable clocks (including low_power ones) of misc RAM */
+	uint32_t misc_ram = LL_MEM_AXISRAM1 | LL_MEM_AXISRAM2 | LL_MEM_AHBSRAM1 | LL_MEM_AHBSRAM2 |
 			   LL_MEM_BKPSRAM | LL_MEM_FLEXRAM | LL_MEM_CACHEAXIRAM | LL_MEM_VENCRAM;
-	LL_MEM_EnableClock(all_ram);
-	LL_MEM_EnableClockLowPower(all_ram);
+	LL_MEM_EnableClock(misc_ram);
+	LL_MEM_EnableClockLowPower(misc_ram);
 
 	/* Set up individual enabled clocks */
 	set_up_fixed_clock_sources();