common: sensor: make pre/post hook api are paired

[DelphineChiu]

Summary:
Some operation need pre/post hook api are paired, e.g., mutex lock/unlock.
Makesure post hook function will be called after sensor reading.

Test plan:
Build and test pass on fby35

1. Check sensor reading is functional.

root@bmc-oob:~# sensor-util --force slot4
slot4:
MB Inlet Temp (0x1) : 24.00 C | (ok)
MB Outlet Temp (0x2) : 45.00 C | (ok)
FIO Temp (0x3) : 22.00 C | (ok)
PCH Temp (0x4) : NA | (na)
SOC CPU Temp (0x5) : 44.00 C | (ok)
SOC Therm Margin (0x14) : -38.00 C | (ok)
CPU TjMax (0x15) : 82.00 C | (ok)
DIMMA Temp (0x6) : 41.00 C | (ok)
DIMMC Temp (0x7) : 39.00 C | (ok)
DIMMD Temp (0x9) : 36.00 C | (ok)
DIMME Temp (0xA) : 39.00 C | (ok)
DIMMG Temp (0xB) : 35.00 C | (ok)
DIMMH Temp (0xC) : 31.00 C | (ok)
SSD0 Temp (0xD) : 27.00 C | (ok)
HSC Temp (0xE) : 39.05 C | (ok)
VCCIN SPS Temp (0xF) : 54.00 C | (ok)
FIVRA SPS Temp (0x10) : 49.00 C | (ok)
EHV SPS Temp (0x11) : 37.00 C | (ok)
VCCD SPS Temp (0x12) : 39.00 C | (ok)
FAON SPS Temp (0x13) : 44.00 C | (ok)
P12V_STBY Vol (0x20) : 11.98 Volts | (ok)
P3V_BAT Vol (0x21) : 3.05 Volts | (ok)
P3V3_STBY Vol (0x22) : 3.33 Volts | (ok)
P1V8_STBY Vol (0x23) : 1.79 Volts | (ok)
P1V05_PCH Vol (0x24) : 1.05 Volts | (ok)
P5V_STBY Vol (0x25) : 4.94 Volts | (ok)
P12V_DIMM Vol (0x26) : 11.92 Volts | (ok)
P1V2_STBY Vol (0x27) : 1.19 Volts | (ok)
P3V3_M2 Vol (0x28) : 3.32 Volts | (ok)
HSC Input Vol (0x29) : 11.87 Volts | (ok)
VCCIN VR Vol (0x2A) : 1.77 Volts | (ok)
FIVRA VR Vol (0x2C) : 1.80 Volts | (ok)
EHV VR Vol (0x2D) : 1.80 Volts | (ok)
VCCD VR Vol (0x2E) : 1.14 Volts | (ok)
FAON VR Vol (0x2F) : 1.02 Volts | (ok)
HSC Output Cur (0x30) : 11.30 Amps | (ok)
VCCIN VR Cur (0x31) : 37.70 Amps | (ok)
FIVRA VR Cur (0x32) : 4.10 Amps | (ok)
EHV VR Cur (0x33) : 1.20 Amps | (ok)
VCCD VR Cur (0x34) : 2.50 Amps | (ok)
FAON VR Cur (0x35) : 21.30 Amps | (ok)
CPU PWR (0x38) : 97.00 Watts | (ok)
HSC Input Pwr (0x39) : 133.10 Watts | (ok)
VCCIN VR Pout (0x3A) : 65.00 Watts | (ok)
FIVRA VR Pout (0x3C) : 6.00 Watts | (ok)
EHV VR Pout (0x3D) : 2.00 Watts | (ok)
VCCD VR Pout (0x3E) : 3.00 Watts | (ok)
FAON VR Pout (0x3F) : 21.00 Watts | (ok)
DIMMA PMIC_Pout (0x1E) : NA | (na)
DIMMC PMIC_Pout (0x1F) : NA | (na)
DIMMD PMIC_Pout (0x36) : NA | (na)
DIMME PMIC_Pout (0x37) : NA | (na)
DIMMG PMIC_Pout (0x42) : NA | (na)
DIMMH PMIC_Pout (0x47) : NA | (na)

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