soc: intel_adsp: ace: Add macro to power down entire HPSRAM

Introduce a new assembly macro, m_ace_hpsram_power_down_entire, which
utilizes Zephyr Devicetree macros to power down the entire HPSRAM on
Intel ADSP ACE platforms.

This macro dynamically retrieves the HPSRAM bank count and control
register address from the Devicetree, streamlining the power-down
process. The macro is designed to iterate over all HPSRAM banks and
issue a power down command to each, ensuring a complete shutdown of the
HPSRAM when required by the system's power management policy.

Signed-off-by: Tomasz Leman <tomasz.m.leman@intel.com>