soc: esp32: opt to make device handles in dram

ESP32 linker loader needs all sections to be align correctly.
When MCUBoot is enabled, device handles provide by device-handles.ld
does not make the ALIGN(4) at the end, which breaks the loader
initialization. This PR make sure that this particular section
is placed in DRAM instead.

For now this is a workaround until this can be handled in loader script.

Signed-off-by: Sylvio Alves <sylvio.alves@espressif.com>
(cherry picked from commit 54ca96f5)