add floppy_content support

[imranh2]

Add floppy_content support. Only 2 line change needed as all the other code is already there :)

[cjlapao]

@imranh2 With what version of PD was this tested?

[imranh2]

@cjlapao latest I believe, why are you seeing issues?

% packer --version
Packer v1.11.2
% prlctl --version
prlctl version 19.4.1 (54985)

[cjlapao]

@imranh2 I didn't test it yet but those functionalities should not work in PD19 as they were deprecated.

I will run some tests and will confirm if the function is still there.

[imranh2]

@cjlapao my testing has led to a floppy disk being created and attached with the right content with no noticeable deprecation warnings :)

If they are being deprecated then maybe it's best to focus on my other PR #119

[imranh2]

Tested working on

% prlctl --version                           
prlctl version 20.1.0 (55732)

[cjlapao]

@bineesh-n Do you see any issues with adding this?