Fix USB MSC more than 2 LUNs support

[Igorbunow]

Fix support more than 2 LUNs into USB MSC device

Now it successfully recognized 4 LUNS:

kernel: [ 1969.997185] scsi 8:0:0:0: Direct-Access     STM      MicroSD Device   0.01 PQ: 0 ANSI: 2
kernel: [ 1969.997830] scsi 8:0:0:1: Direct-Access     STM      EEPROM           0.01 PQ: 0 ANSI: 2
kernel: [ 1969.998390] scsi 8:0:0:2: Direct-Access     STM      System           0.01 PQ: 0 ANSI: 2
kernel: [ 1969.999059] scsi 8:0:0:3: Direct-Access     STM      Test             0.01 PQ: 0 ANSI: 2
kernel: [ 1969.999505] sd 8:0:0:0: Attached scsi generic sg7 type 0

[ALABSTM]

Hi @Igorbunow,

Thank you for this pull-request. We will get back to you with a feedback as soon as possible. Please excuse the delay it may take us sometimes to reply. Thank you for your comprehension.

With regards,

[ALABSTM]

Hi @Igorbunow,

Thank you for this interesting proposal. It has been forwarded to our development teams. We will keep you informed.

With regards,

[ALABSTM]

ST Internal Reference: 126925