bugfix in BinaryBroadcastLayout + unit test

[d-smirnov]

An attempt to fix an issue which appeared when ConverLayout pass
runs on quantized binary operations like qnn.add:
def before():
x = relay.var("x", shape=(2, 2))
y = relay.var("y", shape=(1, 2))
return relay.Function(
[x, y],
relay.qnn.op.add(
x,
y,
lhs_scale=relay.const(0.0156863, "float32"),
lhs_zero_point=relay.const(127, "int32"),
rhs_scale=relay.const(0.0117647, "float32"),
rhs_zero_point=relay.const(85, "int32"),
output_scale=relay.const(0.0235294, "float32"),
output_zero_point=relay.const(128, "int32"),
),
)

The issue manifested itself as
[bt] (2) ./src/tvm/build/libtvm.so(tvm::relay::qnn::QnnBinaryBroadcastLayout(tvm::Attrs const&, tvm::runtime::Array<tvm::tir::Layout, void> const&, tvm::runtime::Array<tvm::tir::Layout, void> const&, tvm::runtime::Array<tvm::Type, void> const&)+0xa9) [0x7fadc080d949]
[bt] (1) ./src/tvm/build/libtvm.so(tvm::runtime::Array<tvm::tir::Layout, void>::operator const+0xb6) [0x7fadc0382996]
[bt] (0) ./src/tvm/build/libtvm.so(+0xb50c12) [0x7fadc037cc12]
File "/workspace/include/tvm/runtime/container.h", line 681
IndexError: Check failed: 0 <= i && i < p->size_: indexing 1 on an array of size 1

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[zhiics]

cc @anijain2305

[anijain2305]

Thanks for finding and fixing the bug! LGTM.