classes/image_types_balena: Add support for device specific boot file…

[acostach]

…system options

The beagleplay is unable to load u-boot from the sd-card boot partition if the standard geometry set by mkfs.vfat is used - that is 16 heads / 63 sectors per track.

We noticed that using a geometry of 16 heads / 32 sectors per track make the device to boot from the sd-card, so we make the boot filesystem options configurable from the device repository to apply this setting.

Change-type: patch

Connects-to:

• https://github.com/balena-os/balena-beaglebone/pull/686/commits/8c17aafb9997d237232e3eb6ae3cd65b1c384ccd
• https://balena.zendesk.com/agent/tickets/3524

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[acostach]

@resin-jenkins retest this please