Apu prerequisites (#1946)

* Don't require powercap support

APUs don't necessarily support setting a power cap from sysfs.
Ignore failures of the file missing.

Signed-off-by: Mario Limonciello (AMD) <superm1@kernel.org>

* Show edge temperature in default output if hotspot is missing

APUs don't have a hotspot temperature, they have an edge though.
Use that.

Signed-off-by: Mario Limonciello (AMD) <superm1@kernel.org>

* Format all "power" keys as watts

There will be more power keys when APU support is added, so format
them properly.

Signed-off-by: Mario Limonciello (AMD) <superm1@kernel.org>

* Don't show power limit in output if it's invalid

APUs can't set power limit using power_cap1 interface.  The limit
will be 0 and thus the UX looks weird in default output.
Only add the `/power_limit` if it's valid.

Signed-off-by: Mario Limonciello (AMD) <superm1@kernel.org>

* Unify sizes of `amdsmi_power_info_t`

Sizes are used inconsistently.  This causes tools to not show
N/A when they should.  Make them unified.

Signed-off-by: Mario Limonciello (AMD) <superm1@kernel.org>

---------

Signed-off-by: Mario Limonciello (AMD) <superm1@kernel.org>

projects/amdsmi/py-interface/amdsmi_interface.py

@@ -3067,7 +3067,7 @@ def amdsmi_get_power_info(
     }
 
     for key, value in power_info_dict.items():
-        if value == 0xFFFF:
+        if value in (MaxUIntegerTypes.UINT8_T, MaxUIntegerTypes.UINT16_T, MaxUIntegerTypes.UINT32_T, MaxUIntegerTypes.UINT64_T):
             power_info_dict[key] = "N/A"
 
     return power_info_dict