The following functions are only defined when CONFIG_PM_ENABLE is defined:
- wifi_apb80m_request()
- wifi_apb80m_release()
This commit makes their linker script mapping statements also dependent on CONFIG_PM_ENABLE
thus fixing some linker errors when CONFIG_PM_ENABLE is disabled.
* add esp-phy-lib submodule
* move libphy.a and phy_init.c from esp_wifi to esp_phy
* move librtc.a from esp_wifi to esp_phy
* move libbtbb.a from bt to esp_phy
* corresponding updates to build system
Include external ram section in the linker template to process it
through linker script generation mechanism. This enables redirection of .bss section to external memory using linker fragments
libnet80211, libpp, libbt, liblwip: Redirect .bss through fragments
