rtc_clk: Clean up some clock related enum and macro in soc/rtc.h, replace with new ones in

soc/clk_tree_defs.h

components/esp_hw_support/clk_ctrl_os.c

@@ -43,7 +43,7 @@ uint32_t periph_rtc_dig_clk8m_get_freq(void)
 {
 #if CONFIG_IDF_TARGET_ESP32H2
     /* Workaround: H2 doesn't have 8MD256 clk, so calibration cannot be done, we just return its theoretic frequency */
-    return RTC_FAST_CLK_FREQ_APPROX;
+    return SOC_CLK_RC_FAST_FREQ_APPROX;
 #else
     return s_rtc_clk_freq * 256;
 #endif