modules: hal_rpi_pico: Add hardware_sha256 to include directories

Add `hardware_sha256/include` to `zephyr_include_directories`.
Use the header only.

Signed-off-by: TOKITA Hiroshi <[email protected]>

Author: soburi

modules/hal_rpi_pico/CMakeLists.txt

@@ -82,6 +82,7 @@ if(CONFIG_HAS_RPI_PICO)
     ${rp2_common_dir}/hardware_boot_lock/include
     ${rp2_common_dir}/hardware_ticks/include
     ${rp2_common_dir}/hardware_sync_spin_lock/include
+    ${rp2_common_dir}/hardware_sha256/include
     ${rp2_common_dir}/pico_bootrom/include
     ${rp2_common_dir}/pico_flash/include
     ${rp2_common_dir}/pico_platform_compiler/include