Fix get_aux_mon_type xcvr API

[dmytroxIntel]

Description

Add error handling to get_aux_mon_type API

Motivation and Context

get_aux_mon_type reads field consts.AUX_MON_TYPE in eeprom on page 1 address 145
If memory model is flat, there is no page 1 in eeprom, only 0_lower and 0_upper
Here get_aux_mon_type doesn't check whether memory model is not flat, this causes errors in running xcvrd

How Has This Been Tested?

Tested on testbed, assured that logs of failed eeprom reading disappeared

Additional Information (Optional)

[dmytroxIntel]

@prgeor please review and merge

[dmytroxIntel]

@prgeor please review and merge

[dmytroxIntel]

@prgeor please review and merge

[dmytroxIntel]

@prgeor please review and merge

[dmytroxIntel]

@richardyu-ms, @StormLiangMS, please review and merge

[StormLiangMS]

LGTM

[StormLiangMS]

@dmytroxIntel Is there CLI we can check if it is flat memory? Or any output in the log?

[dmytroxIntel]

@StormLiangMS didn't find one, I just put such code snipped in sonic_platform.sfp custom plugin to check this

    from sonic_platform_base.sonic_xcvr.mem_maps.public.cmis import CmisMemMap
    from sonic_platform_base.sonic_xcvr.codes.public.cmis import CmisCodes
    from sonic_platform_base.sonic_xcvr.xcvr_eeprom import XcvrEeprom
    from sonic_platform_base.sonic_xcvr.fields import consts

    def flatness(self):
        id_byte_raw = self.read_eeprom(0, 1)
        if id_byte_raw is None:
            return None
        id_byte = id_byte_raw[0]
        if id_byte == 0x18 or id_byte == 0x19 or id_byte == 0x1e:
            eeprom_wrapper = XcvrEeprom(self.read_eeprom, None, CmisMemMap(CmisCodes))
            return eeprom_wrapper.read(consts.FLAT_MEM_FIELD)
        return None

[zhangyanzhao]

@StormLiangMS is this for 202211 release? Otherwise, this need be approved and merged by the maintainer. Suggest to revert this one.

[dmytroxIntel]

@zhangyanzhao , who is maintainer for this repo and file ?
It's not clear from this info https://github.com/sonic-net/sonic-buildimage/blob/master/.github/CODEOWNERS who exactly is in this group "@Azure/sonic-platform"