meta-inspur: fp5280g2: Remove phosphor-power-psu-monitor

Since phosphor-power-psu-monitor is only applicable to IBM's p10
system and is disabled by default, it will not be applicable to
Inspur's fp5280g2 system, remove it.

refer to: https://gerrit.openbmc.org/c/openbmc/openbmc/+/53572



Tested: Successfully build image-bmc on fp5280g2

Signed-off-by: George Liu <liuxiwei@inspur.com>
Change-Id: I2682324dc5bf04078d2b16c0796e5f86f49d3f31