Add internal pins to Nicla Sense's pin map

[kgoveas]

The following pins need to be added in g_APinDescription to be accessed using Arduino wiringDigital APIs.

• INT_ESLOV (GPIO35) : P0_19
• RESET_BHI260 (GPIO16) : P0_18
• INT_BHI260 (GPIO13) : P0_14
• BQ_CD (GPIO30) : P0_25
• CS_FLASH (GPIO31) : P0_26
• CS_BHI260 (GPIO25) : P0_31

[facchinm]

Fixed by #359