memory: samsung: exynos5422-dmc: Correct function names in kerneldoc

Correct kerneldoc to fix W=1 warnings:

    drivers/memory/samsung/exynos5422-dmc.c:290: warning:
        expecting prototype for find_target_freq_id(). Prototype was for find_target_freq_idx() instead
    drivers/memory/samsung/exynos5422-dmc.c:1015: warning:
        expecting prototype for exynos5_dmc_align_initial_frequency(). Prototype was for exynos5_dmc_align_init_freq() instead
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>
Link: https://lore.kernel.org/r/20210206111715.20774-1-krzk@kernel.org

drivers/memory/samsung/exynos5422-dmc.c

@@ -278,7 +278,7 @@ static int exynos5_counters_disable_edev(struct exynos5_dmc *dmc)
 }
 
 /**
- * find_target_freq_id() - Finds requested frequency in local DMC configuration
+ * find_target_freq_idx() - Finds requested frequency in local DMC configuration
  * @dmc:	device for which the information is checked
  * @target_rate:	requested frequency in KHz
  *
@@ -998,7 +998,7 @@ static struct devfreq_dev_profile exynos5_dmc_df_profile = {
 };
 
 /**
- * exynos5_dmc_align_initial_frequency() - Align initial frequency value
+ * exynos5_dmc_align_init_freq() - Align initial frequency value
  * @dmc:	device for which the frequency is going to be set
  * @bootloader_init_freq:	initial frequency set by the bootloader in KHz
  *