soc: intel_adsp: ace: Remove obsolete HPSRAM power change macro

Remove the m_ace_hpsram_power_change macro from asm_memory_management.h
as it is no longer used after refactoring the power_down function to
utilize the new m_ace_hpsram_power_down_entire macro. This cleanup helps
to reduce code complexity and maintainability.

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