soc: place constant data from rtc_clk.c into DRAM
soc: place constant data from rtc_clk.c into DRAM

In release mode, switches in rtc_clk_bbpll_set would be converted to
jump tables. These tables would be placed into .rodata, which caused
rtc_clk_cpu_freq_set to be unusable while cache is disabled. This
manifested itself in crashes when exiting from light sleep:

https://esp32.com/posting.php?mode=reply&f=13&t=3089#pr14590

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